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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bb35eee466d7b7b311494664d8bc81fb025598b93b5aae5816c190b9c7e60b6a' 
  AND token = 'P4XigWRvTMhHAY4waSuI901xWNivOwpOIXzzBrBBGNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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