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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5b8c996190e3df1e8384b37176971186135a1fef5dd3b50e2c9fb54da827c23f' 
  AND token = 'iPoaIM+ym6A119V34ahQ0ewdbDGBGr0yp+vfVGJGX0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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