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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '64f0e09b3ab560f9622ce10064095aee9cb267e18100bae2239d6f8e8c0caac3' 
  AND token = 'QNZlM479L1J9K+yRWChffYk2XhcEQG6Ufr5199lww2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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