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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7bc3db07b7558ae0c0f70927731b68b5afab64a05fa3d1ac6adf43613b0d119e' 
  AND token = 'bitIFimFIUeWUPZlPxh2+rH3ICvxS2RYBoyysNb09uM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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