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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ebe1ff938b9daff4f363057947bcf009f1c89255af9365709b9ecd9c81776754' 
  AND token = 'SC8aD93LszAlQRJkD0UXlLI2PF9fK1Qm/gdCzzX4ySI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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