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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '89c420304ff99689768251685e672e3ec18c86afd60e72d1fc21f3a122f828f5' 
  AND token = 'ACaPEGPZk8mTJ5AoG1uE4+/+sDEJvBIPzc49I1OFuIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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