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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e577eb83c6f0929a0bf4c150b3e42687e1c87baeeb29aee82a653bc394e65ff6' 
  AND token = 'Mvg9iQEfnGmLrCMlc2JDoN76dO5wk38fdpCZsxfbSWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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