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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1bcba51082825d4da3fd62e0d698a04f10ae40ff8d852aea1bc4a95cef13b61f' 
  AND token = 's1Sflf4PjwPTQk6q3Ya8ZMHTQ+WbMb8WQjqPHF7tfJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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