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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b65c5552f4db3b150b4352420f0ec5fa911dc1418bbc51b5ac9f1bacee5ac5af' 
  AND token = 'Kpd0YDuFKULyMmLDrXGEMNMOt8dr0aL41m4hRjTkBlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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