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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c2fb9ee61b637dbcd8d11c7790fbb121b263873106c0c264d8d5c007f722876c' 
  AND token = 'vf9sh07/SNGyG6NxT3kf4Jxd2LENHeuoBYlItOuxPnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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