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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '87f68a403f6563277a0acae936e2ecdfffa67d2f91a1aa79714429d28d6d2180' 
  AND token = 'VjkpWsL05DotY50jDIO26Nfla6njQo1qgVAXya7SxqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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