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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f62be0a1e1eb7007602e164014f1598f3060b362b1c4bada61a5304726f0b0fa' 
  AND token = 'Fz5jKBXPecLhCtHm71pzGKn/cmGKBMbiet3PbDMQwNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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