SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fdf06c218c561565a91f580bf07a0713a8094a59f1ba58b2c991cc4a08862535' 
  AND token = 'xZfmFXMtlchrpgjt2++JiYfG/hIaosGjxFpHRU4BN24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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