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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'be376eedaf5a41d67711b968b4311e02d130583084f07007ae1e54dd0c849483' 
  AND token = 'lecTeh87prH8ILr39G9+LhoPyJkzpDzjJmghPTKmM60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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