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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4abc793a1c1f99ff6b6c94bcc086ec26e118fe0047cce740d8f0a4655b178cc2' 
  AND token = 'm/Fk0UyL/tJ/3OzaaEh+E/d+rnhitTJ5QLm7JmKXzYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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