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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2a1d85a5e46e910a48fb761276d7d40d9a317adb88c6a571632b0eb361f65ff8' 
  AND token = 'ene483w7gMgHnuXfCGuEOKUvu9369g61t6IOwhjVvOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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