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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '595597ed4c80f479cfc56cacf753069705bc8a153dca3050aa8ce01a6ce8436a' 
  AND token = '5hm/WvswYGzEaBuGWMJx3L0Cc50GTs81WdclRftzwVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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