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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2cbd2dfabd7b1c2b1157c56dcce195dfa8522cf26c2890241db13fbc3911f3bd' 
  AND token = 'tit5rOs1c6cihh4IDG0bBSzqtHTHp6c9yrzBNTJh6B4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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