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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '06550922e9737870f066218828699f3cb550f9159f0c21ac5e834705df332a2d' 
  AND token = 'tq+LK0Wa6vv6i5b3DEbjWgnLMTZuZv5MfHP2Pa+n4J8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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