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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f0b1c2e102f7008adbbc8728f6f2cdf9161e1496fcddea5c7642ec69588d39b1' 
  AND token = 'Z6oTPg+yOl/nMQsQckfFdtkpLg38spDHRCmqH9F2EQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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