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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '394cf4b4c7a3b734dd1fd660df393e598b2345997a0565f1a86b1a1e7927a0cb' 
  AND token = '0uggfJrM8NHkjA30Z9b5sIyTdLEmn0b1sYjZD1gRzVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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