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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8da45b24d8fbfa643721d169f63688a283cf28de2d79747adaf79aa92ac2b291' 
  AND token = 'ift6iGupd85Z0t3wiQB36digE2MVvncZW9BuwcyuNoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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