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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e823d5ecf42e5ce429a23624fbe02432ae547c59f9662fdea0a250d155bb3702' 
  AND token = '2BqDgXvdNu76/L1HdsEvx7SWxwECw89GAGbB6s0j2To=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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