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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9150e3dbbb20275a0769e0a4601869043c09863d967ae10d6d7ece67946c5266' 
  AND token = 'OtjY9khpiWa0mP0EgTo4kDTCYQJaBVQh107vawAJi3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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