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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5ba561d60dbf03c9d0a6dc8b5ad70c96559b8142d47e98c413fb9ed1c10caa01' 
  AND token = 'IK4Sbi0bzvETe345dT1814/AiskNzrl9PM0bqc00U7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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