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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '395618b63b1b1b93ad28c86ea389626a01f8db3822c57cfe072cc82b05ef85e9' 
  AND token = 'Kh67LqnqYtxNoIomnJ5kgJU0jrgAnfrc//tDcDA5Hfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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