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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0a0ca840bb7f7b432d1f06d0bfd5d0161a135f77b48be8b78ed78302573bb4d0' 
  AND token = 'ns3Of5uzCLUz3Vl4T4xGiL8YVDmzJLF4jilA7r3kpeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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