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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9b7b82c28ef2c053b4dd262f2850ec4d326f7a838129a50ef18dadab3e659ae6' 
  AND token = '13AMYOwg6L+TGTex07hvfxlfbejOkPEU6XdK7lrydWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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