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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '70b1be791d8954aeb07d279e7629f8b29a967ec047c4aeb9dd96c6158139623c' 
  AND token = 'rZvWb/98BZGH8Ow7JYs7W8YfNTwG8A8yJJ04A4enlUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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