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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bc5570db44f2be36914b81dc493698eef024346d726a7d69b0de399ea60696e5' 
  AND token = '8xJmvBxt4R/8KctAtOVHyf893Tkh3BNbITawdfPOA00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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