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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '950e8b2125b3200d8a0c4784f05d24440e583c2ac3051c87d7bdd616867d8f56' 
  AND token = 'ibG12FpL9qcDpLaj5D0yhzr8c8f9ay/zcUa9/1NSoQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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