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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c1b25743263df2b596ef10dfd80ee393655ed0097716e67c7ecf81dc3fd3f53e' 
  AND token = 'ier0UcbdFZjwk7J8G1PsGz0XPUN06LZu2OUQP9TNKgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}