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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9146c85e1d83687f24f24a4b9b3e586bed4d964f92cc74a8ea204a698b0317f0' 
  AND token = 'kB7nwCDy7qx2gI6pbscHMYKeSCqX8SRnbF+b5s0i9G8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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