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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd464547498823f820c60f32eb444e2d43025a645411104489b7722f505e363e0' 
  AND token = 'Cty6lFbOs8ng7mnhSuelHsOYu9pnPYFog/PT3WGDOXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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