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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '07991d38c0dd1d0b2c347b43061e34631cf726c9eee2117227de1110bc8ad156' 
  AND token = 'WEna4EzzPyBKkdPH8Au1IS6ptPEJEfT1B4d1ShL9jlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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