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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0f6adc35aed6b6dd74ef22438e2375a28c05e4cc28def412dd49331b28a9af7e' 
  AND token = 'vIceQVb6v1+LrcKBTuaSazf86cLK1vO9MigtgO9vT+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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