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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dbcff92ae06eeaec548d0367e03ba8fb826d21a1db4609912f2b27a18d81d37f' 
  AND token = 'q3BfSD4HQeKy3cBNSuzxA0Hsbwo5Ac43t8HCE9YuUXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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