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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e0a904313bef5880c26ab8f17717f9bd138360c288530589ce30acf71a119c9e' 
  AND token = 'dm1j5IJ3CQlOIaK+5osn3HnQVVPIZCk5i9os64FVlgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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