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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ccaa0a0c9e05059ddaf5bb5f9d1d50739c016ee91111e9c0e2d1792be2a3bb64' 
  AND token = '5tCj2lEG6pH3dvpBxGh21eDyKo7vCaxhcl/RyCVtwko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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