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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c49c9ff2587a80700f89a8fb7ea6e3b6d5a33adedaef0e3eac2a66c15f47a03c' 
  AND token = 'kEBO8JHVCfl0CGUa5ZNeq79nhjuAgRF05+d21bAjk1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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