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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c2d8622ad4aa84ce7639e2de2d040393d94dd13a0e6acb85552720fd5b31c0b1' 
  AND token = 'f/DcSgt0XijcydPLVCZSeDAeigu4dm5u/ouohtyfwcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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