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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '599b1bccf3f38c987ed29d04118c75709771eb7e3f4ec48cf1940e24b66b29bc' 
  AND token = 'LKX/cyD8CxQyJr8LrvBhUKpr+iLHey1J3y7qdZOkt5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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