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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3e20d224fd6ba64a92704cffde88f03566002ba796f63ebf0b380b22983db2dc' 
  AND token = 'd9hQfBZj6er8BKvr9tvWHe6xcTk0fXXo7Ugf2PE0hsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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