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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cd6ad03e97bd2b6edb74f01f77164e66e5936b0d86eb8f7978eaee578d9f01ac' 
  AND token = '34vHHWoRAxdBAs0+wLWGRMZ1cKOBjQpOiqR0/1bWj9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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