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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e672bd48eb9f35551e4c7c22ebf87d104067405f4cc68566762115b0b8baec54' 
  AND token = 'HsWA8tGX3zWmjehnZFzTO9SxW0/IsNXUdB4p4suBGWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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