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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ab8912f42325dac65bb3e4c4cf897d5fd8a586dde88fd6c0de6cbc1c821ecdae' 
  AND token = 'iX4X9EJz2rrs7Hk544yaAgBcYmFqR/COqNa9dzCT8cE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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