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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3b80cd95890b6b53061032e4fbd7b7915fa3eddaddab9a687135e3815ae1c9d3' 
  AND token = '2A8OMx37aO7mWRe5e1KR70S4/M8qVoAT8FGUd9Klt+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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