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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd8fee1780b104cb6814a03e530899e685932f8e512879503e366e8f0ea4390ce' 
  AND token = 'n59uOptSYSk1fdmepO6g/cEW6J8w6k1L5i8rTvtkLB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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