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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c5be32b665d5a938c4d420f248ac591cafee639fd8c30f468f6f41a5a5ad3d0f' 
  AND token = 'rZ56Cl7cdfUmkX78PZ4GgE+xcYgo51HYiVMq3HFwmi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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