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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fefe2052326544402b4f8c235906c8d90d77b6e65fc994ee79fa7931377d98e8' 
  AND token = 'ZXL/RkSKKIjIYatl85M26OAy3Byy8+9M0225CRyarjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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