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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1c544a1ccc297468f3864118866e820a8631fc7e574ba988898d461ffdf72a88' 
  AND token = 'fg+2v+fsxe1BX3AcU5QPdnLa7hjbPGTje0kQHiVxj7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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