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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f3b5bff9869c34bfe92ec513c77993f0a718a4df10271c0adbe7ff00e734c6a2' 
  AND token = 'MYE1sb29g7kyAVIOIFUwvFDn4/a8UN43VkNkgiid2IY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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