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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c510c1a299085f6e8d06f5e4eb5bcb6ce89e43eef2dcd045fd9b015a8c5d7f53' 
  AND token = 'Lt6sm2xv8KXfnsWb84r2qgm+GwDXBlO+Xx8SCCVxW0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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