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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '26c1a64f29882f4b5e96e915e5a60d670ec71f6ab4a4f3d5b46da74d5d77d677' 
  AND token = '8A8qdBowcx6mrGcYzbRiQ6TmbZK6x/SZ6ZxyRvNTnCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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