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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ca9987a71e49393def378098eb0122501ffed9a5343413887821c1efec64e230' 
  AND token = 'nzOqBEmf7koVVeuxy4Y6ISQa+BmDH4Dhdbl/VX2tNcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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