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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '059f9a72d38a629bd86af92651457ffca8f8a360cd96f61736bd2289f0a9121c' 
  AND token = 'dES1eC+o8GPeCYeulXRu+VoOzAa5PhUksdXQUbGqAJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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