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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '055d0d520a9ac70b48e4a52edad13eafd106088a1407ea6a189ad001b45a2a5a' 
  AND token = 'L+UTp/mWPAitghIF81NSjNOIOzFvKsL/eowtNTv93U8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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