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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ac97c3d1cefe5aeb31d01343caabc0a18eca2f25394652592cc7906c574f596a' 
  AND token = 'KxAjoNpTI0mJv/51K7yuoixcYBJRZmQO5dKjBxeDwTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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